Rejuvination ?

I'm new to this forum (and a lay person). But I'm quite interested in
genetic research and manipulation. From what I gather, our bodies
except for sperm or eggs cells are somatic that multiply onely a given
amount of times and stop. What work is being done currently on
discovering the mechanism that regulates this process. And are there
theories on scenarious for discovering genes that regulate this process
and modifying or controlling them? For instance, if brain cells could
be made to clone or regenrate themselves, would people lose their
memories and individuality?
-- Enric